Fel-Pro 1205 Chevrolet small block intake manifold gaskets for ported cylinder heads. Port dimensions are 1.28" by 2.09". Gasket thickness is .060 (approximately 1/16"). Suitable for cast iron or aluminum cylinder heads. Designed without a metal core to allow engine builders to trim the gasket for exact fit on modified ports. The base gasket material resists coolant, gasoline, alcohol, oil. Printoseal elastomeric sealing beads are used to provide the extra sealing strength needed around the ports. These gaskets are designed and optimized for true race applications and yet can be used in a street engine. Packaged as a complete intake manifold gasket set.